Global Issues in the Environment and Extraction of Metals

Explain the significance of ozone to life on EarthOzone is a gas that naturally occurs in the stratosphere. It acts as a shield and is able to buy out most of the Sun?s harmful ultraviolet ray of light before it r all(prenominal)es the Earth?s surface. Harmful ultraviolet radiation syndrome can increase the likelihood of skin cancers and eye damage, and wispy down photosynthesis. By having ozone, it protects living things from the harmful high-energy radiation from the Sun.

What accept humans done to damage it?Humans have damaged ozone by using Chlorofluoro degree centigrades. Chlorofluorocarbons ar greenhouse gases that get down ozone. Chlorofluorocarbons are found in factories in developing countries and in some spray cans. Nitrogen oxides from jet aircraft engines when they burn fuels also speeds up ozone destruction. Moreover, hydrogen chloride from space shuttles taking off modify ozone.

Is the damage reversible?The damage done to the ozone layer is reversible but it will take a lot of trend and international cooperation to repair it. It is expected that ozone levels will return to radiation pattern by 2045.

Discuss the different methods used to extract metals from their ores and the advantages and disadvantages of each methodThere are three basic ways of extracting metals from their ores. Pyrometallurgy is the treatment of metals and their ores by heat. Pyrometallurgy includes smelting and roasting.



Smelting is a process of heating and melting ores and then separating the coveted molten metals from other elements. For less stable metals, a step-down agent such as carbon or carbon monoxide is used. For more stable metals, roasting is used. Roasting is the heating of ores in air.

Advantages?At high temperatures, reactions are much faster than they are in slurries or in aqueous solutions.

?In sulfide systems the energy release of oxidation to SO2 can be utilise instead of carbon emission. SO2 is easier to...

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